# chapter03_6
radius = float(input("请输入半径的取值："))
PI = float(input("请输入圆周率的取值："))
diameter = 2 * radius
perimeter = PI * diameter
square = PI * (radius ** 2)
print("diameter的值为：", diameter)
print("perimeter的值为：", perimeter)
print("square的值为：", square)
